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. 2019 Mar 20;9(3):e022006. doi: 10.1136/bmjopen-2018-022006

Table 1.

Descriptive characteristics of the study population (n=748)

N Median IQR Mean SD
Age (years) 748 44.8 9.6
Men N (%) 411 (55)
BMI (kg/m2) 732 27.3 4.8
Seniority (years) 722 13.5 10.3
Administration workers N (%) 128 (17)
Blue-collar workers N (%) 620 (83)
 Cleaning 115 (15)
 Manufacturing 448 (60)
 Transportation 57 (8)
Physical work load at baseline (scale 1–10) 723 5.3 2.4
Sick leave days
 Baseline (days/month) 741 0.0 0.0 0.3 1.9
 Last follow-up (days/month) 655 0.0 0.0 0.4 2.5
 Total days (over all time points) 746 0.0 3.0 5.8 20.9
Work ability (scale 0–10)
 Baseline 646 9.0 2.0 8.5 2.0
 Last follow-up 671 9.0 2.0 8.2 2.4
 Mean work ability (over all time points) 732 8.8 2.5 8.3 1.7
NSP intensity (scale 0–10)
 Baseline 748 2.0 5.0 3.0 2.7
 Last follow-up 652 2.0 4.0 2.4 2.7
 Mean NSP intensity (over all time points) 748 2.0 3.6 2.6 2.3
Number of pain regions at baseline (count) 745 1.0 3.0 1.7 1.5
Compliance to text messages (missing responses, count)
 NSP intensity 748 0.0 1.0 1.2 2.7
 Sick leave 746 0.0 1.0 1.2 2.6
 Work ability 732 0.0 1.0 0.4 0.7

BMI, body mass index; NSP, neck–shoulder pain.